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Mezu ruled the Shadow Realm with his brothers under guidance of Enra. After Enra found out of Hoji's and Ameonna affair, Mezu together with his brothers, under orders of Enra, separates the pair and skins Hoji's face as punishment. Later, after finding out about the plot to overthrow Enra by Xing and Hoji, Mezu interferes and stops the plot. Like other brothers, Mezu sacrifices his memory of his sister to fuel a Whisperer. Mezu is then charged to protect the Outer Gates by Enra.

After Lo Wang actions causes Shadow Realm and Earth to merge, Mezu travels to find a way to seal the Outer Gates. Knowing that the only way to close the gates is through a sacrifice made by an Ancient, he makes a deal with Mamushi Helka. Helka will conceive a child with Mezu and in return he will increase her power. Mezu then rapes Helka's daughter and leaves to look over the Outer Gates until, his new daughter, Kamiko will be strong enough for the sacrifice.

Mezu meets with Lo Wang when the latter is tasked by Mamushi to find the source of black goo in the wildlands. They meet again after Wang tracks Kamiko's father, finding out in the end that it's Mezu. Later, after Ameonna reveals her plans to destroy the Outer Gates and doomed both worlds, he and Wang join forces in order to stop her. In the end he's seen near the gates, where he urges Wang to kill Ameonna. Mezu is last seen watching Wang to be swallowed by a dragon, which comes out of the gates.

Mezu is the most loyal of the brothers to Enra. Like, Gozu, he follows Enra's orders without questioning them. He feels spite to his sister Ameonna because even after stopping Xing's and Hoji's plot to overthrow Enra, Mezu wasn't let to see her. Differently from Enra, Mezu didn't see anything wrong with Hoji's created Whisperers.

His personality changes dramatically after coming to Earth. Mezu becomes obsessed with protecting the Outer Gates from the second Collision, even going as far as raping a woman so he could sacrifice the baby to seal the gates. He despises other humans and is extremely cold to his daughter Kamiko, seeing her only as a tool for his needs. In the end he encourage Kamiko to fulfill her destiny even though is not her fate.

Mezu utilizes ranged attacks and quick dashes to fight Lo Wang. He also can use an AOE ground smash after which his spear becomes stuck and open to attacks. Mezu is the only boss that doesn't persa have a weakness. His weakness is the fact that his hitbox (armor) is really easy to hit, since it's his body plate and than his wings, both of which is easy to hit. A good strategy is the moment after multiple seals need to be broken which means that Mezu wings become the next spot needed to hit and then land 3 rockets into his wing as he lands.

Mezu has light-red skin, long black hair and two short horns. He wears red cape, blue shirt and pants. His battle armor is in blue and golden. His helmet looks like horse head with a crescent head piece on the top of the head. He has dark wings and hoofs. He's weapon is a giant yari.